Leadership

Rob Robinson joined Alliance at its inception in 2012, first serving as Chief Operating Officer before assuming his current position in 2014. Previously he acted as System of Care Administrator and then Deputy Director at The Durham Center, one of the merging partners in Alliance. He has over 25 years of both clinical and managerial experience in the public and private behavioral healthcare fields with a focus on program and system development.

Mr. Robinson is founding president of the North Carolina Association of Public Community Health Plans, serves in a leadership roll for the Association for Community Affiliated Plans, and sits on the board of Cary-based i2i Center for Integrative Health. He has considerable experience in multiple facets of managed care operations and is considered a respected voice within the public behavioral healthcare system in North Carolina and beyond, and was the recipient of a 2025 Corporate Leadership Award from the Triangle Business Journal.

Cheala Garland-Downey has headed Alliance’s Human Resources Department since 2016. In that role she has oversight of the organization’s benefits administration, classification and compensation, employee relations and talent management. Under her leadership, Human Resources serves a fundamental role in fulfilling the organizational goal to recruit, develop and retain a talented, diverse workforce. Ms. Garland-Downey has over 20 years of progressive human resources experience within the private, public and non-profit sectors.

Kelly Goodfellow has served as Chief Financial Officer at Alliance since the company’s inception in 2012, and served in that capacity at The Durham Center (one of the merging partners in Alliance) beginning in 2004. She has responsibility for overall financial strategy and accountability at Alliance including oversight of corporate financial analysis, accounting, budgeting and claims. Ms. Goodfellow has over 20 years of healthcare experience focusing on Medicaid and the uninsured population, and was the recipient of a 2025 Women in Business Award from the Triangle Business Journal.

Throughout his professional life, Alliance Chief Medical Officer Dr. Robert MacArthur has been a health and wellness champion for people with the highest needs and healthcare disparities, and has supported integrated models addressing their cultural, social, behavioral, and physical needs. He has extensive experience in long-range organizational strategic planning, including innovative program development, predictive analytics, and novel care models. He has nurtured productive working relationships with State and Federal regulatory agencies and community advocacy groups, and has successfully recruited, developed and retained high-performing clinical teams around him.

Dr. MacArthur attended Wake Forest University, where he also received his M.S. in Population Biology, and his M.D. from the Wake School of Medicine. He started his career as an internal medicine physician in Greensboro, and followed that with nearly two decades of clinical leadership for UnitedHealth Group and various entities under the UnitedHealth umbrella, including serving as National Medical Director. Immediately preceding his tenure at Alliance Dr. MacArthur served as Chief Medical Officer at Commonwealth Care Alliance in Boston, where he provided executive oversight for all clinical delivery, care management, clinical operations (utilization management), quality, appeals and grievances, member experience functions, and digital health transformation.

Monica Portugal has served as Chief Risk and Compliance Officer at Alliance since the company’s inception in 2012. Her responsibilities at Alliance include oversight of corporate compliance, program integrity, fraud and abuse investigations, risk management and internal audits. Ms. Portugal also has varied professional experience in leadership, policy/advocacy, and regulatory compliance in the public and non-profit sectors.

Sean Schreiber is Chief Innovation and Strategy Officer at Alliance, where he provides enterprise leadership to advance the organization’s operational strategy, innovation agenda, and transformation priorities, designing and driving forward-looking strategies that enhance efficiency, service delivery, and sustainability across the organization’s business operations.

Mr. Schreiber previously served Alliance as Chief Clinical Officer from the company’s inception in 2012 through 2016 and then as Chief Operating Officer until assuming his current role. As COO he oversaw health plan functions including provider network development and operations, information technology, member and provider services, and community health. He has extensive experience developing, implementing and operating new programs and services on both the health plan and behavioral health service delivery sides.

Sara Wilson serves as Chief of Staff at Alliance Health where she helps set the strategic vision for the organization, drives strategic priorities, streamlines enterprise-wide initiatives, and ensures alignment across the organization. With a strong background in healthcare and service delivery, Ms. Wilson serves as a trusted advisor to the CEO advancing initiatives that improve access, affordability, and the member experience. Prior to joining Alliance she held leadership roles in education, social services, and service delivery, specializing in supporting individuals with IDD and TBI.

Carol Wolff joined Alliance as General Counsel in 2014 and leads the Office of Legal and Public Affairs, which comprises the in-house legal department, communications, government affairs, and Medicaid contract waiver management. As a public entity, Alliance benefits from her nearly 25 years of experience with public government, healthcare and general in-house counsel work. Ms. Wolff has oversight of all aspects of the law impacting Alliance, including personnel, contracts, managed care, and state, federal and local funding contracts, the communications department, and a government affairs team that guides strategy and legislative priorities for the organization.

Shawn Mazyck has responsibility for leading the development and execution of the Alliance provider network strategy and oversight of all network management and operations functions. He leads Alliance efforts to build a comprehensive network of high-quality, accessible, and specialized providers to meet the overall health needs of its members. Mr. Mazyck previously served as the Associate Vice President of Network Development for the mid-Atlantic region of Beacon Health Options. He has an extensive background in the development of new network builds and has served as the network lead for new member benefit designs. He also previously worked in network development as a Senior Physician Network Contract Manager for United Healthcare.

Ann Oshel has led Alliance’s community engagement since the company’s inception in 2012, and currently heads up the Community Health and Well-Being department, which focuses on the social determinants of health, integration of physical and behavioral healthcare, and population health. In her role she has oversight for priority initiatives including community outreach, supportive housing, system of care, and community change. Prior to coming to Alliance Ms. Oshel was director of Durham County, NC’s nationally-recognized system of care, and also served in various clinical roles in the private sector.

Brian Perkins joined Alliance in 2017 to oversee the company’s government relations program, which includes managing Alliance’s legislative agenda and related strategic planning initiatives. Previously he served as Director of Government Affairs and Legislative Counsel for the North Carolina Department of Health and Human Services, and on Capitol Hill from 2008-2015 as counsel and senior health policy advisor for a United States senator and members of Congress.

Tammy Thomas joined Alliance in 2015 and provided leadership in building and developing the Project Portfolio Management Office. With 20+ years of experience and education in project management, business operations, and healthcare, she is well-equipped to serve in her current role of Senior Vice President of Business Evolution. Her main area of focus is to lead Alliance in the evolution of business by directing the implementation efforts of large-scale cross-functional business changes and strategic priorities for organizational transformation, new business development, solution/program design, and strategic initiative implementation. Prior to joining Alliance, she held responsibilities in project management, portfolio management, analytics, and program evaluation with Blue Cross Blue Shield NC.

Dianna White is an accomplished financial executive with over two decades of experience leading finance, accounting, and strategic operations in both the public and private sectors. As Senior Vice President of Financial Operations at Alliance Health, she provides leadership across budgeting, regulatory compliance, financial systems, and Medicaid financial strategy. Her work ensures operational alignment with complex state and federal guidelines while supporting the organization’s mission-driven healthcare initiatives.

Before joining Alliance, Dianna held key finance roles at BlueCross BlueShield of North Carolina, and Sharp HealthCare. She has a deep background in technical accounting, joint ventures, financial planning, capitation models, and audit management. At Sharp, she managed multimillion-dollar reimbursements, implemented cutting-edge decision tools, and was recognized with multiple organizational awards for financial innovation and recovery efforts. Dianna began her career in audit with Deloitte, where she specialized in healthcare, life sciences, and real estate, managing complex audits for both private and public companies. Dianna holds a Bachelor of Science in Business Administration with an emphasis in Accounting, and is a licensed CPA in the state of California.